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The Major Killers of Americans: Research and Prevention Humans need oxygen to live. Our lungs take in air that contains oxygen. Our heart pumps the blood that goes to the lungs to fill our blood full of oxygen and then p
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Document Date: 2015-03-28 10:06:01
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The Major Killers of Americans: Research and Prevention Humans need oxygen to live. Our lungs take in air that contains oxygen. Our heart pumps the blood that goes to the lungs to fill our blood full of oxygen and then p